By Shereen Jegtvig NEW YORK (Reuters Health) – Bariatric surgery results in substantial weight loss and can turn back some diseases related to obesity, a new study finds. They were interested in updating current knowledge about the effectiveness and safety of various types of weight loss surgery, including gastric bypass, adjustable gastric banding (lap banding), vertical banded gastroplasty and sleeve gastrectomy. These surgical procedures are used for people who are severely obese, or moderately obese with serious weight-related health problems. “Previous reviews included data from clinical trials and studies published before 2003, but because of advances in technology of bariatric surgery and accumulation of surgeons’ experience, information provided in previous reviews is outdated,” Su-Hsin Chang told Reuters Health in an email.